Washington has pushed its allies to jump aboard Donald Trump's new campaign to isolate the Iranian economy. Iran has said nations joining US economic sanctions against it would be considered enemies. Key points and original sources are listed below.

• Washington has pushed its allies to jump aboard Donald Trump's new campaign to isolate the Iranian economy.S1

• Iran has said nations joining US economic sanctions against it would be considered enemies. Earlier this week, President Trump had announced what he called the "most crushing economic operation" against Tehran.S2

• Official says any state joining US would be considered an enemy and Tehran would target their interests in retaliation.S3

• The warning comes as US President Donald Trump threatens to isolate Iran economically to weaken its government.S4